Hi,
I agree with Bill, I have had some models with waves that are my
best performers. It is not clear if the waves help things or if the
model would even be better if the waves were gone. It impossible to
know. Typically I try not to make waves. I also find that equal
flaps on both sides of the wing is not necessary.
As for fixing a waving wing, well I have had some success with
basically treating it like you would if you were making a bottle
prop. Soak the wood in water for an hour or so and then put in a
form and bake at 250F. I have also had some success with putting a
seal coat on the wing, and placing it in a form and allowing the
finish to dry (again baking it). With both of these methods the wing
comes out pretty straight, but after some temperature/humidity
changes the wings trends to wave again, not as bad as the original
waves...but they do come back.
Kurt
--- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen"
<wdgowen_at_e...> wrote:
>
> Bruce
> My answer wasn't completely a joke. I've actually seen very little
difference in performance for a nice straight wing compared to one
that is wavy. Aki said that his Cat II glider of a few years ago had
waves in the trailing edge but it still did something like 55
seconds. Some of the waves in the flaps will go away when you bend in
camber. After that there are 2 main challenges:
>
> 1. How to get both wing panels in the same warp configuration and
the more frustrating one -
> 2. Figuring out what is the correct warp configuration.
>
> I generally wind up putting more and more camber in as a contest
day progresses but I'm not convinced that this is the best approach.
Also, where do you want the camber high point? When you're getting
down into the Re=6 to 10k range the Kroo airfoils or the NACA 4702
start looking very good theoretically. Both of these have very
rearward high points - the NACA 4702 being at 70% chord and the Kroo
R6 being at around 80%. Both would probably be disastrous on a rigid
wing but on a flapper they aren't that bad to deal with.
> Bill Gowen
> Decatur, GA USA
>
>
> ----- Original Message -----
> From: Bruce McCrory
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Sunday, December 18, 2005 10:00 AM
> Subject: [Indoor_Construction] Re: Exclusive club
>
>
> Bill,
> In general, I feel pretty isolated with any interest I have.
Then,
> spontaneous generation comes out of the woodwork. [One of my
mixed
> cliche's.]
>
> I attack new projects on a micro level. The process adds time to
> agonizingly slow building, but I'm usually pretty satisfied with
the
> results, once completed. Gliders are not a first love, but they
> certainly are complex. They are more complex than most non-glider
> people think.
>
> Bruce in Seattle
>
> --- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen"
> <wdgowen_at_e...> wrote:
> >
> > Bruce, I think you have joined one of the smallest splinter
groups
> in indoor flying - low ceiling gliders. As far as I know the
> membership is you, Kurt, Jerry, Chris and me!
> > Bill Gowen
> > Decatur, GA USA
> > Bruce in Seattle
> >
> > (Almost close with one Cat. 1 and one Cat. 2, if the waves
> would go
> > away.)
> >
>
>
>
>
>
>
>
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Received on Sun Dec 18 2005 - 07:53:38 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:44 CET